Ported TB
Race Director
Joined: Dec 2013
Posts: 12,502
Likes: 3,628
Depends, is the TB the choke point in the turbulence, or is the intake manifold the turbulence choke point instead?
If you have a OEM LS-2 intake manifold, that it's the nightmare in the math of why the motor can not breath at higher RPM's, until its Turbulence problems are resolved, then little will a ported TB resolve in the grander scheme of things.
Also, are you running open loop, or close loop?
If you have a OEM LS-2 intake manifold, that it's the nightmare in the math of why the motor can not breath at higher RPM's, until its Turbulence problems are resolved, then little will a ported TB resolve in the grander scheme of things.
Also, are you running open loop, or close loop?
Drifting
Joined: Jul 2006
Posts: 1,786
Likes: 93
From: Charlotte N.C.
If you use the same size TB, most of the CNC ported throttle bodies do not require a retune. Depending on how aggressive the hand ported throttle bodies are you may need to adjust the idle airflow tables a bit. At the end of the day I had more problems with my hand ported TB throwing codes. My CNC unit although less aggressive has been fine requiring no additional tuning.
Thread Starter
Racer
Joined: Oct 2012
Posts: 458
Likes: 22
From: OK
Depends, is the TB the choke point in the turbulence, or is the intake manifold the turbulence choke point instead?
If you have a OEM LS-2 intake manifold, that it's the nightmare in the math of why the motor can not breath at higher RPM's, until its Turbulence problems are resolved, then little will a ported TB resolve in the grander scheme of things.
Also, are you running open loop, or close loop?
If you have a OEM LS-2 intake manifold, that it's the nightmare in the math of why the motor can not breath at higher RPM's, until its Turbulence problems are resolved, then little will a ported TB resolve in the grander scheme of things.
Also, are you running open loop, or close loop?
If you use the same size TB, most of the CNC ported throttle bodies do not require a retune. Depending on how aggressive the hand ported throttle bodies are you may need to adjust the idle airflow tables a bit. At the end of the day I had more problems with my hand ported TB throwing codes. My CNC unit although less aggressive has been fine requiring no additional tuning.
Melting Slicks
Joined: Nov 2013
Posts: 2,577
Likes: 68
From: Memphis Tn
Drifting
Joined: Jul 2005
Posts: 1,630
Likes: 188
From: Austin TX
If you currently have a tune, I would ask your tuner. A reputable tuner will give you straight up advice and not look to make extra $$. I have heard from most tuners (in person or on the forum) that it is not needed. Also, if you do have a reputable tuner, they may retune for a small cost if needed.
I will add that I do have a ported TB and have not gotten a tune because of it. The TB will increase your throttle response which will mostly be seen on the track.
I will add that I do have a ported TB and have not gotten a tune because of it. The TB will increase your throttle response which will mostly be seen on the track.
